Floyd Mayweather Jr. was in a fit of jealousy over a basketball player when he allegedly attacked his baby mama, Josie Harris and threatened to kill the pair … this according to the police report obtained by TMZ.

According to the report, Mayweather read text messages on Josie’s phone … which included messages from C.J. Watson (pictured below), who plays for the Chicago Bulls. According to the report, Mayweather screamed, “‘Are you having sex with C.J.?’ Harris replied, ‘Yes, that is who I’m seeing now.'”

According to the report, the 10-year-old son of Mayweather and Harris told cops he “saw his dad was on his mother and was hitting and kicking her.”

According to the report, “Harris stated that Mayweather began yelling at Harris, ‘I’m going to kill you and the man your (sic) are messing around with.’ He also stated, ‘I’m going to have you both disappear.'”

The police report says Harris was taken to Southern Hills Hospital and treated for “minor facial injuries and a sore left arm.” Pictures of the injuries were taken.

The police report goes on to say while Harris was at the hospital Mayweather called Georgia Parker — Harris’ friend who lives in the house — and told her to get out of the house.

As for why Mayweather was arrested for grand larceny Friday … the police report says he left with her Apple iPhone 4 … valued at $322.17.

SMH @ Floyd being arrested over taking his baby mama’s cellphone.

And in a predictable developing news, CJ Watson is now denying being involved with Josie Harris.

Multiple sources close to C.J. — including his father Charles Watson — tell TMZ that the NBA player is only in a relationship with his longtime girlfriend Danielle — with whom he has a child.

C.J.’s dad — who says he talks to C.J. every day — also tells us, “I know for sure that Josie is not his girlfriend … she did some event planning for C.J., but other than that, they have no relationship whatsoever.”

Charles adds, “C.J. would never do anything like that to Mayweather [Jr.] … he doesn’t need that.”

Yeah cuz an NBA player having more than one girlfriend NEVER happens right? SMH. Can’t say we blame C.J. (or his dad) for trying to distance him from Floyd’s baby mama though. Who wants a professional boxer on their azz.